Sophia awakens as a "child of taboo", a forbidden being born between angels and demons, destined to become a succubus and face a cruel and ephemeral destiny. Her life seems doomed to inevitable tragedy... until, after an untimely death, she returns to the past with a second chance.

Determined to change her destiny, Sophia embarks on a struggle against the forces that wish to eradicate her. On her way, she is supported by her stepbrother Ares and Evan, a member of a powerful demonic family in conflict with the angels.

But as the truth about her existence is revealed, a question looms over her future: will she remain a victim of her forbidden lineage or become the greatest danger to those who fear her?